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Sev Marchal
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Sev Marchal
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Application filed by Sev MarchalfiledCriticalSev Marchal
Application grantedgrantedCritical
Publication of FR547433ApublicationCriticalpatent/FR547433A/fr
G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
G10K9/10—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers driven by mechanical means only
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Physics & Mathematics
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Engineering & Computer Science
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Acoustics & Sound
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Multimedia
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FR547433D1922-02-181922-02-18Perfectionnements aux avertisseurs électriques
ExpiredFR547433A
(fr)